Africanized Bees
These bees, also known as Killer Bees, were engineered by humans from a crossbreed of various European honeybees and the East African honeybee. They were first introduced in 1956, in the hopes of increasing honey production in Brazil. Unfortunately, 26 swarms escaped a year later, spreading to North and South America. Africanized bees are deadly because they are more aggressive than other species and are also quicker to react to disturbances.